Compound steam-engine.



PATENTED JULY 21, 1903'.

KW. T. BENNETT. GOMPOUND' STEAM ENGINE.

Prummel msn 0011s, 19.02.

N0 MODEL.

f oc y, Fig. 2.

Zito. 734.03%.

UNITED ,STATESv WILLIAM THOMAS BENNETT,

Patented July 21, 1903.

OF SUNDERLAND, CANADA.

COMPOUND STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 734,037, dated July 21, 1903. y

Application filed October 16,1902. Serial No. 127.589. (No model.)

To @ZZ whom it may concern:

Be it known thatl, WILLIAM THOMAS BEN- NETT, manufacturer, of the village of Sunderland, in the county of Ontario, in the Provi ince of Ontario, Canada, have invented certain new and useful Improvements in Compound Stearn-Engines, ot' which the following is a specification. v

My invention relates to improvements in compound steam-engines; and the object of the invention is to produce an economical noiseless compound enginein which there will be no liability of condensation of steam, in which the full benefit of the steam will be employed in compounding, in which all pas-A sage-ways to utilize high and low pressure are dispensed with, in which the piston-rod and stufng-box are eliminated and the number of working parts materially reduced, and Y in which gas, gasolene,or other expansive uid may be employed with but slight change; and it consists, essentially, of a cylinder supported on a suitable bed and having an extension-sleeve and suitableinletand exhaust ports, a. hollow piston having a reduced outer end and ports in the same located in proximity to thel piston-head, a balance-valve plug, and a connecting-rod connected at one 'end to the crank-shaft and at the opposite end pivotally connected to the piston and having the inner end of the rod designed to coact with the end of the valve-plug, so as to impart an oscillating movement to same and bring the ports in the valve to register periodically with the port-s in the piston at the end of the high-pressure stroke,and thereby expand into the cylinder to theopposite side of the piston, as hereinafter more particularly explained.

Figure l is a perspective view, partially in section, showing a compound engine constructed in accordance with my invention. Fig. 2 is a longitudinal section through the engine. Fig. 3 is a cross-section on the line Fig. 4 is a cross-section on the line fr' fy, Fig. 2.

In the drawings like letters of reference indicate corresponding parts in each figure.

A is the bed of the engine, B the cylinder, and C a reduced extension thereof, which is inside of such end plate.

attached to or forms part of the bed-plate,

I the cylinder being preferably bolted to such extension.

D is arotary inlet-valve, and E is a rotary exhaust-valve, which are connected together .inthe usual manner by'eccentrics and are so timed that when the inlet-valve is opened the exhaust-valve is closed, and vice versa.

F is the piston, which is hollow, as indicated, and is provided with an end plate f and the usual packing-ringsf, 1ocated tothe The piston F has a reduced portion F, such portionbeing provided with ports f2, diainet'rically opposite each other. v

f3 is apacking-ring on the inner-.end of the extension-sleeve C. p

- G is the valve-plug, having the diametrically opposite ports g, extending into the recessed end of the valve-plug, as indicated.

The piston has an intermediate cross-wall F2, through which the end stem g' of the valveplug extends.

H is a disk which is securely keyed onv the end of the stem g and is provided with a right-angular notch or recess h.

I is a connecting-rod which is suitably con-y nected at one end to the crank-shaft of the engine. The opposite rectangular end is pivotally connected by the pin z' to the parallel end bars F3, which are attached to or form part of the piston.

The end of the connecting-rod I is provided with an extension I','to which is secured a pin t', having a roller 't"-, which tits in the right-angular notch h in the diskv H.

When the steam isadmitted to the inletport, it passes behind the ring-face of the piston peripherally outside the recessed portion and forces the piston to the opposite end. In so doing as the connecting-.rod is brought by the crank in the direction indicated by arrow the valve is held closed. As soon as the pistou reaches the opposite endthe end of the connecting-rod oscillating throws, by means of the roller, the notch in the disk around to the position shown in dotted lines in Fig. 4. and as the disk is connected to the plugvalve the ports f2 and g opposite each other, near the end of the stroke, thereby allowing the steam, which is at high pressure, to pass 'and expand into the low-pressure end of the cylinder and exert such pressure upon the much larger surface of the piston and drive the piston backwardly to the opposite end.

It will be understood that the valve is only momentarily opened and that such opening is arranged to take place only upon the piston reaching the end of its outward movement. The valve-plug G is during the movement of the piston backward and forward caused to register with the ports g periodically, as hereinbefore explained, during but a short portion of the movement of the piston and is held closed by the roller of the connectingrod operating against the notch h in the disk H, so as to throw the solid portion of the plug-valve opposite the openings f2.

It will be seen that the valve such as I describe between the high-pressure end of the piston and the low-pressure end is a perfectly-l balanced valve, and therefore there is but a minimum amount of wear on the same.

It will also be seen by my construction of piston that I entirely dispense with the piston-rod and that there is no danger of any rattle in the engine. As there are no high and low pressure cylinders, and consequently no connectingr passage-ways, it Will be understood that no condensation of steam can take place, as the cylinder is always kept at a temperature which will not permit of condensation.

What I claim as my invention is l. In a compound engine, the combination with the cylinder and extension thereof and the inlet and exhaust ports, of a hollow piston having openings extending through the same, a rotary valve in such piston provided with openings designed to be brought to register with the openings in the piston, to open communication through the piston to the opposite end of the cylinder when the piston has reached the limit of its high-pressure stroke as and for the purpose specified.

2. In a compound engine, the combination with the cylinder and extension thereof of less diameter than the cylinder and the inlet and exhaust ports, of a hollow piston provided with a reduced portion fitting into the extension and having openings in proximity to the piston-head, and an intermediate crosswall, ofa valve-plug provided with openings designed to register with the openings in the piston and having a recessed end extending through the outer end of the piston and astem extending through the wall and means for turning such stem when the piston has reached the limit of its high-pressure stroke as and for the purpose specified.

3. In a compound engine, the combination with the cylinder and extension thereof of less diameter than the cylinder and the inlet and exhaust ports, of a hollow piston provided with a reduced portion fitting into the extension and having openings in proximity to the piston-head, and an intermediate crosswall, of a valve-plug provided with openings designed to register with the openings in the piston and having a recessed end extending through theouter end of the piston and a stem extending through the wall, a disk secured on the end of the stem provided with a notch and means from the main shaft for operating against such notch to slightly oscillate the disk when the piston has reached the limit of its high-pressure stroke as and for the purpose specified.

4. In acompound engine, the combination with the cylinder and extension thereof of less diameter than the cylinder and the inlet and exhaust ports, of a hollow piston provided with a reduced portion fitting into the extension and having openings in proximity to the piston-head, and an intermediate crosswall, of a valve-plug provided with openings designed to register with the openings in the piston and having a recessed end extending through the outer end of the piston and a stem extending through the wall, a disk secured on the end of the stem provided with a notch, a crankshaft, the connecting-rod connected at one end of the same and a pin extending through the piston at the opposite end to which said rod is connected, an extension on the connecting-rod, a roller on said extension designed to engage and coact with the notch, to oseillate the disk and the valve connected thereto when the piston has reached the limit of its high-pressure stroke as and for the purpose specified.

WM. THOMAS BENNETT.

Witnesses:

B. BOYD, G. S. BATE. 

